Year	Number of
1990	352.98
1991	370.7
1992	389.55
1993	410.34
1994	432.43
1995	456.4
1996	480.86
1997	507.01
1998	536.44
1999	567.14
2000	599.54
2001	628.63
2002	659.26
2003	695.44
2004	732.5
2005	770.96
2006	811.55
2007	853.81
2008	901.84
2009	952.91
2010	1007.94
2011	1061.68
2012	1119.02
2013	1179.52
2014	1243.66
2015	1311.64
2016	1377.65